.content {
    background-color: #f66;
}
.box {
    z-index: 99999;
    position: fixed;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.3);
}
.text {
    width: 300px;
    height: 200px;
    background-color: white;
    border-radius: 20px;
    margin: 200px auto;
    text-align: center;
    line-height: 200px;
    position: relative;
}
.x {
    position: absolute;
    right: 5px;
    top: -15px;
    width: 30px;
    height: 30px;
    line-height: 30px;
    background-color: red;
    border-radius: 50%;
}